JP3632586B2 - Battery and manufacturing method thereof - Google Patents

Battery and manufacturing method thereof Download PDF

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JP3632586B2
JP3632586B2 JP2000326080A JP2000326080A JP3632586B2 JP 3632586 B2 JP3632586 B2 JP 3632586B2 JP 2000326080 A JP2000326080 A JP 2000326080A JP 2000326080 A JP2000326080 A JP 2000326080A JP 3632586 B2 JP3632586 B2 JP 3632586B2
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battery
positive electrode
current collecting
negative electrode
current collector
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JP2002134157A (en
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良隆 神戸
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Toyota Motor Corp
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

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  • Connection Of Batteries Or Terminals (AREA)

Description

【０００１】
【発明の属する技術分野】
本発明は、特定の集電構造を有することにより製造工程を簡素化することのできる電池、およびその製造方法に関する。
なお、本明細書中において「電池」とは、ニッケル水素電池、リチウムイオン電池などのいわゆる電池以外に、キャパシタをも含む意味で使用する。
【０００２】
【従来の技術】
長尺状の正極側電極シートおよび負極側電極シートと、両電極シートの間に配されるセパレータとを巻回してなる巻回型の電極体を備えた電池が知られている。例えば特開平９−９２３３５号公報には、両電極シートの側端面に活物質を塗布しない領域を設け、その部分を複数個の短冊状リード（集電リード部）として正極負極それぞれの集電端子に接続する円筒型二次電池が開示されている。また、複数枚の正極側電極シート、負極側電極シートおよびセパレータを積層してなる積層型の電極体を備えた電池においても、各電極シートの側端面に形成された集電リード部を集電端子に接続することが知られている。
通常、上記集電リード部と集電端子とは溶接により接続される。そして、この集電端子の溶接工程を実施した後に、電池容器に電極体を収容して固定する構造が一般的である。
【０００３】
【発明が解決しようとする課題】
しかし、上記のような集電構造をもつ電池を製造するには、いったん集電リード部に集電端子を接続（固定）した後、さらに電極体を電池容器に収容して固定する工程が必要となるため、電池の製造に要する工程数が多くコスト高である。また、集電リード部と集電端子との接続には溶接等の方法を用いているので、生産効率の向上や自動化が困難である。
【０００４】
本発明の目的は、集電構造の形成が容易であり、組立工程を簡素化することのできる電池、およびその製造方法を提供することにある。
【０００５】
【課題を解決するための手段】
本発明の第１の電池は、電極体の側端面に形成された集電リード部と、該電極体の外側または内側に向けて拡がる第一テーパ面をもつ集電フランジ部材と、該第一テーパ面に対向する第二テーパ面をもつ固定部材と、を備え、正極側の上記固定部材の少なくとも第二テーパ面から外部に至る部分は導電性材料からなり、該導電性材料により外部と導通し、上記第一テーパ面および上記第二テーパ面により上記集電リード部が挟持されていることを特徴とする。
また、本発明の第２の電池は、電極体の側端面に形成された正極リード部および負極リード部と、該電極体の外側または内側に向けて拡がる第一テーパ面をもつ正極集電部材および負極集電部材と、該正極集電部材の第一テーパ面に対向する第二テーパ面をもつキャップ部材と、該負極集電部材の第一テーパ面に対向する第二テーパ面をもち、上記電極体、上記正極集電部材および上記負極集電部材を収容する電池容器と、を備え、上記正極集電部材の第一テーパ面および上記キャップ材の第二テーパ面により上記正極リード部が挟持され、上記負極集電部材の第一テーパ面および上記電池容器の上記第二テーパ面により上記負極リード部が挟持されていることを特徴とする。
【０００６】
本発明の第１の電池は、上記集電リード部が上記第一テーパ面側に引き出されるようにして上記集電フランジ部材を上記電極体の側端面に配置した後、該電極体および該集電フランジ部材を電池容器に収容し、次いで、上記フランジ部材の上方に上記固定部材を載置し、その後、上記電池容器と上記固定部材とを固定することにより、上記第一テーパ面と上記第二テーパ面との間を圧縮して上記集電リード部を挟持するとともに上記電極体を固定する方法によって好適に製造することができる。
本発明の第２の電池は、上記正極リード部及び上記負極リード部が上記正極集電部材及び上記負極集電部材の第一テーパ面側に引き出されるようにして上記正極集電部材及び上記負極集電部材を上記電極体の側端面に配置した後、該電極体並びに該正極集電部材および該負極集電部材を電池容器に収容し、次いで、上記正極集電部材および上記負極集電部材の上方に上記正極固定部材および負極固定部材を載置し、その後、上記電池容器と上記正極固定部材および負極固定部材とを固定することにより、上記第一テーパ面と上記第二テーパ面との間を圧縮して上記正極リード部及び上記負極リード部を挟持するとともに上記電極体を固定する方法によって好適に製造することができる。
【０００７】
【発明の実施の形態】
以下、実施例により本発明を具体的に説明する。
（１）電池の全体構成
本発明を適用した巻回型のリチウムイオン二次電池を図１に示す。この電池は、電極体１、この電極体１の図１における上側の側端面に形成された正極リード部（集電リード部）１ａおよび下側の側端面に形成された負極リード部（集電リード部）１ｂ、電極体１の正極リード部１ａ側に配置された正極集電部材（集電フランジ部材）２、電極体１の負極リード部１ｂ側に配置された負極集電部材（集電フランジ部材）３、正極集電部材２の上方に配置されたキャップ部材（固定部材）４、電極体１および両集電部材２、３を収容しキャップ部材４にかしめ固定された電池容器５、を備える。
【０００８】
正極リード部１ａは、正極集電部材２のもつ第一テーパ面２１およびキャップ部材４のもつ第二テーパ面４１により挟持されている。一方、電池容器５は底部に第二テーパ面５１が形成された有底円筒状であって、負極集電部材３のもつ第一テーパ面３１および電池容器５のもつ第二テーパ面５１により負極リード部１ｂが挟持されている。すなわちこの電池容器５は、特許請求の範囲に記載の「固定部材」を兼ねている。正極リード部１ａおよび負極リード部１ｂは、他の部材と溶接されてはおらず、第一テーパ面２１、３１および第二テーパ面４１、５１に圧接されることによって外部との導通がとられている。
【０００９】
（２）製造方法
この電池は、底面に第二テーパ面５１の形成された電池容器５（固定部材を兼ねる）の開口部から、正極集電部材２および負極集電部材３を上下側端面に装着した電極体１を挿入し、次いで正極集電部材２の上方にキャップ部材４を配置した後、キャップ部材４と底面との間に圧縮力を加えつつ電池容器５の開口部をかしめる等の方法により製造することができる。
以下、この電池の製造方法についてさらに詳しく説明する。
【００１０】
（２−１）電極体の作製
図２に示すように、正極シート１１は、例えば厚さ２５μｍのアルミニウム箔からなる長尺状の正極集電体１１１と、この正極集電体１１１の両面に設けられた厚さ８５μｍの正極活物質層１１２とからなる。正極活物質層１１２は、コンマコーターまたはダイコーター方式により正極集電体１１１の両面に正極活物質ペースト（正極活物質、導電化材、バインダ等を混練したペースト）を塗布した後、乾燥、プレスすることにより形成される。正極活物質としては、リチウム電池として機能するものであれば特に限定されず、例えばＬｉＭｎ２Ｏ４、ＬｉＣｏＯ２、ＬｉＮｉＯ３等を用いることができる。正極集電体１１１の一方の長辺には、正極活物質層１１２の形成されない帯状域が残されており、ここに厚さ１００μｍ×幅１０ｍｍ×長さ３０ｍｍのアルミニウム箔からなる正極集電リード１ａが５０ｍｍ間隔で溶接されている。
【００１１】
負極シート１２は、例えば厚さ３０μｍの銅箔からなる長尺状の負極集電体１２１と、この負極集電体１２１の両面に設けられた厚さ８０μｍの負極活物質層１２２とからなる。この負極活物質層１２２の形成方法は正極活物質層１２１と同様である。負極活物質としては、リチウム電池として機能するものであれば特に限定されず、例えばグラファイトカーボン、アモルファスカーボン等を用いることができる。負極集電体１２１の一方の長辺には、負極活物質層１２２の形成されない帯状域が残されており、ここに厚さ１００μｍ×幅１０ｍｍ×長さ３０ｍｍの銅箔からなる負極集電リード１ｂが５０ｍｍ間隔で溶接されている。
【００１２】
セパレータ１３は、例えば厚さ２５μｍの多孔質ポリプロピレンからなる。
図２に示すように、これらを正極シート１１、セパレータ１３、負極シート１２、セパレータ１３の順に重ね（正極リード部１ａと負極リード部１ｂとが反対側となるように積層する）、巻芯１４の周囲に巻回して電極体１を得る。
この巻芯１４は、ポリフェニルサルフェート等の樹脂、または表面に樹脂、セラミックス等の絶縁層を設けた金属からなり、正極シート１１等が巻回される幅よりもやや長い大径部１４１と、両端に形成された小径部１４２と有する段付円柱状である。大径部１４１と小径部１４２との間には、正極集電部材２および負極集電部材３を係止する段付面１４３が形成されている。
【００１３】
（２−２）集電部材の装着
アルミニウム製の正極集電部材２は、図３および図４に示すように、略円筒状の外側環状部２２と内側環状部２３とが、十字状の連結部２４によって繋がれた形状をなす。外側環状部２２と内側環状部２３との間には、４つの扇型の貫通孔２５が形成されている。外側環状部２２の内周面には、図４の上側に向かうにつれて外側に拡がる（すなわち、電極体１の外側に拡がる）第一テーパ面２１が形成されている。
負極集電部材３は銅製であり、その形状は正極集電部材２と同一であって、外側環状部３２と内側環状部３３が連結部３４によって繋がれ、その間に４つの貫通孔３５が形成されている。外側環状部３２の内周面には、電極体１の外側に拡がる第一テーパ面３１が形成されている。
【００１４】
図５に示すように、電極体１の上側端面および下側端面に正極集電部材２および負極集電部材３を、それぞれ第一テーパ面２１、３１の形成された側が電極体１と反対側に配置される向きで、内側環状部２２、３２に小径部１４２を挿入して装着する。このとき、正極リード部１ａおよび負極リード部１ｂをそれぞれ貫通孔２５、３５に通し、第一テーパ面２１、３１側に引き出されるようにする。正極集電部材２および負極集電部材３は、巻芯１４の上下に形成された段付面１４３にそれぞれ係止される。また、正極リード部１ａおよび負極リード部１ｂをやや曲げ変形させておく（例えば、第一テーパ面２１、３１に近づける方向に）ことにより、装着された正極集電部材２および負極集電部材３の組立途中におけるリード部の脱落を予防することもできる。
【００１５】
（２−３）電池容器への収容
図６に示すように、電池容器５はステンレス製の深絞り缶であって、その底面には前述のように第二テーパ面５１が形成されている。この第二テーパ面５１は、負極集電部材３の第一テーパ面３１に対応した形状であって、図６の下方に向かって拡がっている。なお、電池容器５の材質としては、ステンレスの他、アルミニウム、メッキ鋼板等を用いることができる。
この電池容器５内に、正極集電部材２および負極集電部材３を装着した電極体１を挿入すると、電池容器５の底面に形成された第二テーパ面５１と第一テーパ面３１とが負極リード部１ｂを挟んで対向する。
【００１６】
ここで、電池容器５内に図示しない電解液を注入する。電解液としては、例えばジエチルカーボネート（ＤＥＣ）とエチレンカーボネート（ＥＣ）との重量比７：３の混合溶媒に、１ｍｏｌ／リットルのＬｉＰＦ６を溶解させたものを用いることができる。
【００１７】
（２−４）キャップ部材の配置
図７に示すように、キャップ部材４は、下端面と側面との間に形成された第二テーパ面４１と、その上方に形成された鍔部４２とを有する円柱状である。このキャップ部材４は、電池容器５の内部空間を密閉するとともに電池容器５との間を絶縁するシールドゴム、電池内圧の過剰な上昇を防止する安全弁（いずれも図示せず）等を備える。キャップ部材４の少なくとも第二テーパ面４１から外部に至る部分はアルミニウム、ニッケル、貴金属（Ａｇ、Ａｕ、Ｐｔ）等の導電性材料からなり、これにより外部との導通を可能としている。
【００１８】
両集電部材２、３を装着した電極体１を電池容器５に収容した後、正極集電部材２の上方において電池容器５に絞り部５２を設ける。次いで、電池容器５の開口部からキャップ部材４を挿入して絞り部５２にて係止する。第一テーパ面２１と第二テーパ面４１とは正極リード部１ａを挟んで対向する。
【００１９】
（２−５）リード部の挟持
キャップ部材４を下方に押圧しつつ、電池容器５の開口部をかしめてキャップ部材４と固定し、電池内部と外部空間とを遮断する。この押圧により、図１に示すように、キャップ部材４が正極集電部材２に押しつけられ、第二テーパ面４１と第一テーパ面２１とが圧縮されて正極リード部１ａが挟持される。また、正極集電部材２および負極集電部材３は段付面１４３と当接しているので、キャップ部材４に加えられた押圧力により負極集電部材３が電池容器５の底面に押しつけられる。これにより、第一テーパ面３１と第二テーパ面５１とが圧縮されて負極リード部１ｂが挟持される。また、このキャップ部材４と電池容器５との間にかかる圧縮力によって電極体１が保持固定される。
【００２０】
この製造方法によると、電池容器５の内部に、両集電部材２、３を装着した電極体１、電解液、およびキャップ部材４を順に挿入した後、電池容器５の開口部をかしめるという簡単な操作により電池を組み立てることができる。開口部をかしめる際、正極リード部１ａおよび負極リード部１ｂがキャップ部材４および電池容器５にそれぞれ圧接されることにより集電構造が形成され、この集電構造を形成するために溶接を行う必要はない。また、電池の軸方向に圧縮力を加えることにより、正極リード部１ａおよび負極リード部１ｂと外部との接続と、電池容器５内における電極体１の固定とを一つの工程で行うことができる。
【００２１】
なお、上記実施例では電池容器５をかしめにより固定したが、キャップ部材４を下方に押圧しつつ電池容器５をキャップ部材４に溶接して固定してもよい。また、上記実施例では正極集電部材２および負極集電部材３を巻芯１４に係止したが、正極集電部材２および負極集電部材３を巻芯１４にネジ止めする構成とすることもできる。さらに、上記実施例では電極体１から離れるに従って第一テーパ面２１、３１が外側に拡がる形状としたが、逆に電極体の内側に向けて拡がる形状の第一テーパ面としてもよい。
【００２２】
【発明の効果】
本発明の電池は、第一テーパ面と第二テーパ面との間に集電リード部が挟持された集電構造を備える。この集電構造の形成には溶接工程を必要としないので、製造効率がよく自動化も容易である。また、本発明の製造方法によると、電池容器内に各部材を順次挿入し、最後に電極容器と固定部材とを固定することにより、集電リードの挟持と電極体の固定とを一工程で行うことができる。
本発明の電池およびその製造方法は、巻回型電池および積層型電池のいずれにも適用することができる。巻回型電池に適用した場合には、本発明の集電構造を備えることによる効果がよく発揮されるため好ましい。
【図面の簡単な説明】
【図１】本発明の電池を示す縦断面図である。
【図２】実施例の電池の製造方法において、電極体の形成工程を示す平面図である。
【図３】実施例の電池における集電部材を示す平面図である。
【図４】図３のＩＶ−ＩＶ線断面図である。
【図５】実施例の電池の製造方法において、電極体の両側端面に集電部材を装着した段階を示す縦断面図である。
【図６】実施例の電池の製造方法において、電極体および集電部材を電池容器に収容した段階を示す縦断面図である。
【図７】実施例の電池の製造方法において、キャップ部材を配置した段階を示す縦断面図である。
【符号の説明】
１：電極体、１ａ：正極リード部（集電リード部）、１ｂ：負極リード部（集電リード部）、１４：巻芯、１４３：段付面、２：正極集電部材（集電フランジ部材）、２１：第一テーパ面、３：負極集電部材（集電フランジ部材）、３１：第一テーパ面、４：キャップ部材（固定部材）、４１：第二テーパ面、５：電池容器（固定部材）、５１：第二テーパ面。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a battery that can simplify a manufacturing process by having a specific current collecting structure, and a method for manufacturing the same.
In the present specification, the term “battery” is used to include a capacitor in addition to a so-called battery such as a nickel metal hydride battery or a lithium ion battery.
[0002]
[Prior art]
2. Description of the Related Art A battery having a wound electrode body formed by winding a long positive electrode sheet and a negative electrode sheet and a separator disposed between both electrode sheets is known. For example, in Japanese Patent Laid-Open No. 9-92335, a region where no active material is applied is provided on the side end surfaces of both electrode sheets, and that portion is used as a plurality of strip-shaped leads (current collecting lead portions). A cylindrical secondary battery connected to the battery is disclosed. Further, even in a battery having a laminated electrode body formed by laminating a plurality of positive electrode sheets, negative electrode sheets and separators, current collecting lead portions formed on the side end surfaces of the electrode sheets are collected. It is known to connect to a terminal.
Usually, the said current collection lead part and current collection terminal are connected by welding. And the structure which accommodates and fixes an electrode body in a battery container after implementing this welding process of a current collection terminal is common.
[0003]
[Problems to be solved by the invention]
However, in order to manufacture a battery having a current collecting structure as described above, it is necessary to first connect (fix) the current collecting terminal to the current collecting lead part and then accommodate and fix the electrode body in the battery container. Therefore, the number of steps required for manufacturing the battery is large and the cost is high. In addition, since a method such as welding is used to connect the current collecting lead portion and the current collecting terminal, it is difficult to improve production efficiency or to automate.
[0004]
An object of the present invention is to provide a battery in which a current collecting structure can be easily formed and the assembly process can be simplified, and a method for manufacturing the same.
[0005]
[Means for Solving the Problems]
A first battery of the present invention includes a current collecting lead portion formed on a side end surface of an electrode body, a current collecting flange member having a first tapered surface extending toward the outside or the inside of the electrode body, and the first A fixing member having a second taper surface facing the taper surface, and at least a portion of the fixing member on the positive electrode side extending from the second taper surface to the outside is made of a conductive material, and is electrically connected to the outside by the conductive material. And the said current collection lead | read | reed part is clamped by said 1st taper surface and said 2nd taper surface, It is characterized by the above-mentioned.
Further, the second battery of the present invention includes a positive electrode current collecting member having a positive electrode lead portion and a negative electrode lead portion formed on a side end surface of the electrode body, and a first taper surface extending toward the outside or the inside of the electrode body. And a negative electrode current collector, a cap member having a second taper surface facing the first taper surface of the positive electrode current collector, and a second taper surface facing the first taper surface of the negative electrode current collector, A battery container that houses the electrode body, the positive electrode current collecting member, and the negative electrode current collecting member, and the positive electrode lead portion is formed by the first tapered surface of the positive electrode current collecting member and the second tapered surface of the cap material. The negative electrode lead portion is sandwiched between the first taper surface of the negative electrode current collector and the second taper surface of the battery container.
[0006]
In the first battery of the present invention, after the current collecting flange member is arranged on the side end surface of the electrode body such that the current collecting lead portion is drawn out to the first tapered surface side, the electrode body and the current collector are arranged. The electric flange member is accommodated in the battery container, and then the fixing member is placed above the flange member, and then the battery container and the fixing member are fixed, whereby the first tapered surface and the first It can be suitably manufactured by a method of compressing between the two taper surfaces to sandwich the current collecting lead portion and fixing the electrode body.
The second battery of the present invention is configured such that the positive electrode lead portion and the negative electrode lead portion are drawn to the first tapered surface side of the positive electrode current collector member and the negative electrode current collector member. After the current collecting member is disposed on the side end face of the electrode body, the electrode body, the positive current collecting member and the negative current collecting member are accommodated in a battery container, and then the positive current collecting member and the negative current collecting member The positive electrode fixing member and the negative electrode fixing member are placed on the upper side, and then the battery container and the positive electrode fixing member and the negative electrode fixing member are fixed, whereby the first tapered surface and the second tapered surface are It can be suitably manufactured by a method of compressing the gap and sandwiching the positive electrode lead portion and the negative electrode lead portion and fixing the electrode body.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described specifically by way of examples.
(1) Overall Configuration of Battery FIG. 1 shows a wound lithium ion secondary battery to which the present invention is applied. This battery includes an electrode body 1, a positive electrode lead portion (current collecting lead portion) 1a formed on the upper side end surface in FIG. 1 of the electrode body 1, and a negative electrode lead portion (current collecting) formed on the lower side end surface. Lead portion 1b, positive electrode current collector member (current collecting flange member) 2 disposed on the positive electrode lead portion 1a side of the electrode body 1, and negative electrode current collector member (current collector) disposed on the negative electrode lead portion 1b side of the electrode body 1 Flange member) 3, cap member (fixing member) 4 disposed above the positive electrode current collecting member 2, battery case 5 which accommodates the electrode body 1 and both current collecting members 2, 3 and is caulked and fixed to the cap member 4, Is provided.
[0008]
The positive electrode lead portion 1 a is sandwiched between the first tapered surface 21 of the positive electrode current collector 2 and the second tapered surface 41 of the cap member 4. On the other hand, the battery container 5 has a bottomed cylindrical shape with a second tapered surface 51 formed at the bottom, and the negative electrode current collector 3 has a first tapered surface 31 and a second tapered surface 51 of the battery container 5 to form a negative electrode. The lead part 1b is clamped. That is, the battery container 5 also serves as a “fixing member” described in the claims. The positive electrode lead portion 1a and the negative electrode lead portion 1b are not welded to other members, and are electrically connected to the outside by being pressed against the first tapered surfaces 21 and 31 and the second tapered surfaces 41 and 51. Yes.
[0009]
(2) Manufacturing method In this battery, the positive electrode current collector member 2 and the negative electrode current collector member 3 are arranged on the upper and lower end faces from the opening of the battery container 5 (also serving as a fixing member) having the second tapered surface 51 formed on the bottom surface. After the mounted electrode body 1 is inserted and then the cap member 4 is disposed above the positive electrode current collecting member 2, the opening of the battery container 5 is caulked while applying a compressive force between the cap member 4 and the bottom surface. It can manufacture by the method of.
Hereinafter, the manufacturing method of this battery will be described in more detail.
[0010]
(2-1) Production of Electrode Body As shown in FIG. 2, the positive electrode sheet 11 includes a long positive electrode current collector 111 made of, for example, an aluminum foil having a thickness of 25 μm, and both surfaces of the positive electrode current collector 111. And a positive electrode active material layer 112 having a thickness of 85 μm. The positive electrode active material layer 112 is coated with a positive electrode active material paste (a paste obtained by kneading a positive electrode active material, a conductive material, a binder, etc.) on both surfaces of the positive electrode current collector 111 by a comma coater or a die coater method, and then dried, pressed It is formed by doing. The positive electrode active material is not particularly limited as long as it functions as a lithium battery. For example, LiMn 2 O 4 , LiCoO 2 , LiNiO 3 and the like can be used. On one long side of the positive electrode current collector 111, a band-like region where the positive electrode active material layer 112 is not formed is left. Here, a positive electrode current collector lead made of an aluminum foil having a thickness of 100 μm × width 10 mm × length 30 mm 1a is welded at intervals of 50 mm.
[0011]
The negative electrode sheet 12 includes a long negative electrode current collector 121 made of, for example, a copper foil having a thickness of 30 μm, and a negative electrode active material layer 122 having a thickness of 80 μm provided on both surfaces of the negative electrode current collector 121. The formation method of the negative electrode active material layer 122 is the same as that of the positive electrode active material layer 121. The negative electrode active material is not particularly limited as long as it functions as a lithium battery. For example, graphite carbon, amorphous carbon, or the like can be used. On one long side of the negative electrode current collector 121, a band-like region where the negative electrode active material layer 122 is not formed is left, and a negative electrode current collector lead made of a copper foil having a thickness of 100 μm × width of 10 mm × length of 30 mm is left here. 1b is welded at intervals of 50 mm.
[0012]
The separator 13 is made of, for example, porous polypropylene having a thickness of 25 μm.
As shown in FIG. 2, these are stacked in the order of the positive electrode sheet 11, the separator 13, the negative electrode sheet 12, and the separator 13 (stacked so that the positive electrode lead portion 1 a and the negative electrode lead portion 1 b are on the opposite side), and the core 14 To obtain an electrode body 1.
The core 14 is made of a resin such as polyphenyl sulfate, or a metal having an insulating layer such as a resin or ceramic on the surface, and has a large diameter portion 141 that is slightly longer than the width around which the positive electrode sheet 11 or the like is wound, It is a stepped cylinder having a small diameter portion 142 formed at both ends. A stepped surface 143 is formed between the large diameter portion 141 and the small diameter portion 142 to lock the positive electrode current collector 2 and the negative electrode current collector 3.
[0013]
(2-2) Mounting of current collecting member As shown in FIGS. 3 and 4, the positive electrode current collecting member 2 made of aluminum has a substantially cylindrical outer annular portion 22 and an inner annular portion 23 connected in a cross shape. A shape connected by the portion 24 is formed. Four fan-shaped through holes 25 are formed between the outer annular portion 22 and the inner annular portion 23. A first tapered surface 21 is formed on the inner peripheral surface of the outer annular portion 22 so as to expand outward as it goes upward in FIG. 4 (that is, expand outward of the electrode body 1).
The negative electrode current collecting member 3 is made of copper, and the shape thereof is the same as that of the positive electrode current collecting member 2. The outer annular portion 32 and the inner annular portion 33 are connected by the connecting portion 34, and four through holes 35 are formed therebetween. Has been. A first tapered surface 31 that extends to the outside of the electrode body 1 is formed on the inner peripheral surface of the outer annular portion 32.
[0014]
As shown in FIG. 5, the positive electrode current collecting member 2 and the negative electrode current collecting member 3 are disposed on the upper end surface and the lower end surface of the electrode body 1, respectively, and the side on which the first tapered surfaces 21 and 31 are formed is opposite to the electrode body 1. The small-diameter portion 142 is inserted and attached to the inner annular portions 22 and 32 in the direction in which they are arranged. At this time, the positive electrode lead portion 1a and the negative electrode lead portion 1b are passed through the through holes 25 and 35, respectively, and are drawn out to the first tapered surfaces 21 and 31 side. The positive electrode current collecting member 2 and the negative electrode current collecting member 3 are respectively engaged with stepped surfaces 143 formed on the upper and lower sides of the core 14. Further, the positive electrode current collector member 2 and the negative electrode current collector member 3 are attached by bending the positive electrode lead portion 1a and the negative electrode lead portion 1b slightly (for example, in a direction approaching the first tapered surfaces 21 and 31). It is also possible to prevent the lead part from falling off during the assembly of the lead.
[0015]
(2-3) Housing in Battery Container As shown in FIG. 6, the battery container 5 is a deep-drawn can made of stainless steel, and the second tapered surface 51 is formed on the bottom surface thereof as described above. The second taper surface 51 has a shape corresponding to the first taper surface 31 of the negative electrode current collecting member 3 and extends downward in FIG. In addition, as a material of the battery container 5, aluminum, a plated steel plate, etc. other than stainless steel can be used.
When the electrode body 1 equipped with the positive electrode current collecting member 2 and the negative electrode current collecting member 3 is inserted into the battery container 5, the second tapered surface 51 and the first tapered surface 31 formed on the bottom surface of the battery container 5 are formed. Opposite the negative electrode lead portion 1b.
[0016]
Here, an electrolyte solution (not shown) is injected into the battery container 5. As the electrolytic solution, for example, a solution obtained by dissolving 1 mol / liter of LiPF 6 in a mixed solvent of diethyl carbonate (DEC) and ethylene carbonate (EC) in a weight ratio of 7: 3 can be used.
[0017]
(2-4) Arrangement of Cap Member As shown in FIG. 7, the cap member 4 includes a second tapered surface 41 formed between the lower end surface and the side surface, and a flange 42 formed above the second tapered surface 41. It has a cylindrical shape. The cap member 4 includes a shield rubber that seals the internal space of the battery container 5 and insulates the battery container 5, a safety valve (none of which is shown), and the like that prevents an excessive increase in battery internal pressure. At least a portion of the cap member 4 extending from the second tapered surface 41 to the outside is made of a conductive material such as aluminum, nickel, or a noble metal (Ag, Au, Pt), thereby enabling conduction to the outside.
[0018]
After the electrode body 1 equipped with both the current collecting members 2 and 3 is accommodated in the battery container 5, the throttle part 52 is provided in the battery container 5 above the positive electrode current collecting member 2. Next, the cap member 4 is inserted from the opening of the battery container 5 and locked by the throttle portion 52. The 1st taper surface 21 and the 2nd taper surface 41 oppose on both sides of the positive electrode lead part 1a.
[0019]
(2-5) While pressing the holding cap member 4 of the lead portion downward, the opening portion of the battery container 5 is caulked to be fixed to the cap member 4 to block the inside of the battery from the external space. As shown in FIG. 1, the cap member 4 is pressed against the positive electrode current collecting member 2 by this pressing, the second tapered surface 41 and the first tapered surface 21 are compressed, and the positive electrode lead portion 1 a is sandwiched. Further, since the positive electrode current collecting member 2 and the negative electrode current collecting member 3 are in contact with the stepped surface 143, the negative electrode current collecting member 3 is pressed against the bottom surface of the battery container 5 by the pressing force applied to the cap member 4. Thereby, the 1st taper surface 31 and the 2nd taper surface 51 are compressed, and the negative electrode lead part 1b is clamped. In addition, the electrode body 1 is held and fixed by a compressive force applied between the cap member 4 and the battery container 5.
[0020]
According to this manufacturing method, after the electrode body 1, the electrolyte solution, and the cap member 4 with the current collector members 2 and 3 mounted therein are sequentially inserted into the battery container 5, the opening of the battery container 5 is caulked. A battery can be assembled by a simple operation. When caulking the opening, the positive electrode lead portion 1a and the negative electrode lead portion 1b are pressed against the cap member 4 and the battery container 5 to form a current collecting structure, and welding is performed to form the current collecting structure. There is no need. Further, by applying a compressive force in the axial direction of the battery, the positive electrode lead portion 1a and the negative electrode lead portion 1b can be connected to the outside and the electrode body 1 can be fixed in the battery container 5 in one step. .
[0021]
In the above embodiment, the battery container 5 is fixed by caulking, but the battery container 5 may be fixed to the cap member 4 by welding while pressing the cap member 4 downward. Moreover, in the said Example, although the positive electrode current collection member 2 and the negative electrode current collection member 3 were latched to the core 14, it shall be set as the structure which screws the positive electrode current collection member 2 and the negative electrode current collection member 3 to the core 14 with a screw. You can also. Furthermore, in the said Example, although it was set as the shape which the 1st taper surfaces 21 and 31 expand outside as it leaves | separates from the electrode body 1, it is good also as a 1st taper surface of the shape which expands toward the inner side of an electrode body conversely.
[0022]
【The invention's effect】
The battery of the present invention includes a current collecting structure in which a current collecting lead portion is sandwiched between a first tapered surface and a second tapered surface. Since the formation of the current collecting structure does not require a welding process, manufacturing efficiency is high and automation is easy. Further, according to the manufacturing method of the present invention, each member is sequentially inserted into the battery container, and finally, the electrode container and the fixing member are fixed, thereby holding the current collecting lead and fixing the electrode body in one step. It can be carried out.
The battery of the present invention and the manufacturing method thereof can be applied to both a wound battery and a stacked battery. When applied to a wound battery, the effect of providing the current collecting structure of the present invention is well exhibited, which is preferable.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing a battery of the present invention.
FIG. 2 is a plan view showing an electrode body forming step in the battery manufacturing method of the example.
FIG. 3 is a plan view showing a current collecting member in the battery of the example.
4 is a cross-sectional view taken along the line IV-IV in FIG. 3;
FIG. 5 is a longitudinal sectional view showing a stage in which current collecting members are attached to both end faces of the electrode body in the battery manufacturing method of the example.
FIG. 6 is a longitudinal sectional view showing a stage in which an electrode body and a current collecting member are accommodated in a battery container in the battery manufacturing method of the example.
FIG. 7 is a longitudinal sectional view showing a stage where a cap member is arranged in the battery manufacturing method of the example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1: Electrode body, 1a: Positive electrode lead part (current collection lead part), 1b: Negative electrode lead part (current collection lead part), 14: Winding core, 143: Stepped surface, 2: Positive electrode current collection member (Current collection flange) Member), 21: first tapered surface, 3: negative electrode current collecting member (current collecting flange member), 31: first tapered surface, 4: cap member (fixing member), 41: second tapered surface, 5: battery container (Fixing member), 51: 2nd taper surface.

Claims (5)

電極体の側端面に形成された集電リード部と、該電極体の外側または内側に向けて拡がる第一テーパ面をもつ集電フランジ部材と、該第一テーパ面に対向する第二テーパ面をもつ固定部材と、を備え、
正極側の上記固定部材の少なくとも第二テーパ面から外部に至る部分は導電性材料からなり、該導電性材料により外部と導通し、
上記第一テーパ面および上記第二テーパ面により上記集電リード部が挟持されていることを特徴とする電池。A current collecting lead portion formed on the side end surface of the electrode body, a current collecting flange member having a first taper surface extending toward the outside or the inside of the electrode body, and a second taper surface facing the first taper surface A fixing member having
The portion extending from at least the second tapered surface to the outside of the fixing member on the positive electrode side is made of a conductive material, and is electrically connected to the outside by the conductive material.
The battery, wherein the current collecting lead portion is sandwiched between the first tapered surface and the second tapered surface. 電極体の側端面に形成された正極リード部および負極リード部と、該電極体の外側または内側に向けて拡がる第一テーパ面をもつ正極集電部材および負極集電部材と、該正極集電部材の第一テーパ面に対向する第二テーパ面をもつキャップ部材と、該負極集電部材の第一テーパ面に対向する第二テーパ面をもち、上記電極体、上記正極集電部材および上記負極集電部材を収容する電池容器と、を備え、A positive electrode lead portion and a negative electrode lead portion formed on a side end surface of the electrode body; a positive electrode current collector member and a negative electrode current collector member having a first taper surface extending outward or inward of the electrode body; A cap member having a second taper surface facing the first taper surface of the member; and a second taper surface facing the first taper surface of the negative electrode current collector member, the electrode body, the positive electrode current collector member and the A battery container containing a negative electrode current collecting member,
上記正極集電部材の第一テーパ面および上記キャップ材の第二テーパ面により上記正極リード部が挟持され、上記負極集電部材の第一テーパ面および上記電池容器の上記第二テーパ面により上記負極リード部が挟持されていることを特徴とする電池。The positive electrode lead portion is sandwiched between the first tapered surface of the positive current collecting member and the second tapered surface of the cap material, and the first tapered surface of the negative current collecting member and the second tapered surface of the battery container A battery, wherein a negative electrode lead portion is sandwiched. 上記キャップ部材の少なくとも第二テーパ面から外部に至る部分は導電性材料からなり、該導電性材料により外部と導通している請求項２記載の電池。The battery according to claim 2, wherein at least a portion of the cap member extending from the second tapered surface to the outside is made of a conductive material and is electrically connected to the outside by the conductive material. 請求項１記載の電池の製造方法であって、A battery manufacturing method according to claim 1, comprising:
上記集電リード部が上記第一テーパ面側に引き出されるようにして上記集電フランジ部材を上記電極体の側端面に配置した後、該電極体および該集電フランジ部材を電池容器に収容し、次いで、上記フランジ部材の上方に上記固定部材を載置し、その後、上記電池容器と上記固定部材とを固定することにより、上記第一テーパ面と上記第二テーパ面との間を圧縮して上記集電リード部を挟持するとともに上記電極体を固定することを特徴とする電池の製造方法。After the current collecting flange member is disposed on the side end surface of the electrode body such that the current collecting lead portion is drawn out to the first tapered surface side, the electrode body and the current collecting flange member are accommodated in a battery container. Then, the fixing member is placed above the flange member, and then the battery container and the fixing member are fixed to compress the space between the first tapered surface and the second tapered surface. A battery manufacturing method characterized by sandwiching the current collecting lead portion and fixing the electrode body. 請求項２又は３記載の電池の製造方法であって、It is a manufacturing method of the battery of Claim 2 or 3,
上記正極リード部及び上記負極リード部が上記正極集電部材及び上記負極集電部材の第一テーパ面側に引き出されるようにして上記正極集電部材及び上記負極集電部材を上記電極体の側端面に配置した後、該電極体並びに該正極集電部材および該負極集電部材を電池容器に収容し、次いで、上記正極集電部材および上記負極集電部材の上方に上記正極固定部材および負極固定部材を載置し、その後、上記電池容器と上記正極固定部材および負極固定部材とを固定することにより、上記第一テーパ面と上記第二テーパ面との間を圧縮して上記正極リード部及び上記負極リード部を挟持するとともに上記電極体を固定することを特徴とする電池の製造方法。The positive electrode lead member and the negative electrode lead member are drawn to the first tapered surface side of the positive electrode current collector member and the negative electrode current collector member so that the positive electrode current collector member and the negative electrode current collector member are disposed on the electrode body side. After being disposed on the end face, the electrode body, the positive current collector and the negative current collector are accommodated in a battery container, and then the positive electrode fixing member and the negative electrode are disposed above the positive current collector and the negative current collector. A fixing member is placed, and then the battery container and the positive electrode fixing member and the negative electrode fixing member are fixed to compress the space between the first taper surface and the second taper surface to thereby form the positive electrode lead portion. And a method for producing a battery, wherein the electrode body is fixed while sandwiching the negative electrode lead portion.
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